how to remove text without erasing the trasparent background

Do you have the layered file?

Could you please post screenshots taken at View > 100% with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible? 

Generative Fill might help i fyou need to create the background. 

You'd probably have to do allot of cloning in order to remove that text. Have you used the cloning tool yet? If so its really not that difficult. But you will have to be careful and patient. I would make a copy of that layer and practice on the other so that if you make a mistake, you have another copy to work with.